for me it is totally common to use Brainstorming or Focus Meetings as a format to gather input and feedback for a specific project that someone wants to push forward to enact his/her accountability. The role in need of input simply asks other roles that are part of the project or that he seeks input from to attend.
You don't have to hold a meeting though. If the path is crystal clear and the role filler has the feeling that he doesn't need extra advice, he of course should just go and do a next action ("Just do it").
Hope that helps a bit.